Development of bamboo‐derived sorbents for mercury removal in gas phase
Development of bamboo‐derived sorbents for mercury removal in gas phase
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DOI：
10.1080/09593330.2010.501087
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发表时间：
2011-03
影响因子：
2.8
通讯作者：
Naved A. Siddiqui;J. Don;K. Mondal;A. Mahajan
中科院分区：
文献类型：
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作者：
Naved A. Siddiqui;J. Don;K. Mondal;A. Mahajan
以竹子为原料，在惰性气氛中炭化，然后用二氧化碳进行物理化学活化，最后在盐酸中酸化，合成了活性炭吸附剂。使用了带和不带表皮组织(树皮)的竹条。分析了处理后样品的形貌和比表面积的变化。还分析了各阶段处理后各吸附剂的吸附特性，并将数据与吸附剂物理特性的变化进行了关联。对这些样品进行了动力学研究。在室温下，考察了元素汞在这些碳上的吸附平衡和吸附动力学。考察了不同吸附剂负荷和初始元素汞浓度下的元素汞吸收情况。估算了不同条件下制备的吸附剂的吸附速率常数和传质常数。测定了元素汞在这些活性碳上的吸附等温线，并用Langmuir和Freundlich吸附等温式进行了关联。结果表明，整个吸附过程是传质控制的，吸附平衡可用线性等温线描述。
Activated carbon sorbents were synthesized from bamboo precursors by carbonization in an inert atmosphere followed by physiochemical activation with carbon dioxide and finally acidulation in hydrochloric acid. Bamboo strips with and without the epidermal tissue (bark) were used. The morphology and specific surface area changes due to the treatment were analysed. The adsorption characteristics of these sorbents after each stage of treatment were also analysed and the data were correlated to the changes in the physical characteristics of the sorbents. Kinetic studies were conducted on these samples. The adsorption equilibrium and kinetics of elemental mercury adsorption on these carbons were evaluated at room temperature. Elemental mercury uptake at different sorbent loading and initial elemental mercury concentrations were examined. The adsorption rate constants and the mass transfer constants were estimated for the sorbents prepared under different conditions. Adsorption isotherms of the elemental mercury on these activated carbons were determined and correlated with Langmuir and Freundlich adsorption isotherm equations. It was found that the overall process was mass transfer controlled and that the adsorption equilibrium could be described by a linear isotherm for the concentrations used in this study.